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Applications
Duplex with 2 reverse acting outputs
Two reverse acting outputs with: no offset, no restrictive output limits, and a
neutral relative gain with PID control.
PARAMETER SETTINGS
Figure 7.4
Duplex with Two Reverse Acting
Outputs
ACTION:1 = REVERSE
ACTION:2 = REVERSE
PID OFST.:1 = 0
PID OFST.:2 = 0
LOW OUT = 0
HIGH OUT = 100
REL. GAIN = 1.0
Out 1
(Heat)
Out 2
(Cool)
100%
100%
Out 1
Out 2
0%
0%
100%
50%
PID OUTPUT
0%
Duplex with a gap between outputs
A reverse acting output 1 and a direct acting output 2 react with: a positive offset
for output 1 and a negative offset for output 2 (assume no restrictive output limits
and a neutral relative gain with PID control).
On the graph, a positive offset refers to an offset to the left of 50%; a negative
offset is to the right of 50%.
Figure 7.5
Duplex with a Gap Between
Outputs
PARAMETER SETTINGS
ACTION:1 = REVERSE
ACTION:2 = DIRECT
PID OFST.:1 = + VALUE
PID OFST.:2 = – VALUE
LOW OUT = 0
HIGH OUT = 100
REL. GAIN = 1.0
Out 1
(Heat)
Out 2
(Cool)
100%
100%
Out 1
Out 2
0%
0%
100%
78
Chapter 7
Offset 1
50%
PID OUTPUT
Offset 2
0%
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